OK, so I was going to brew up blacklab's orange/cascade pale ale. It looks so good, and im pretty excited. Ive already got all the ingredients lined out except for the orange zest. My LHBS was out, but i guess Id rather use a fresh orange anyways. Now, would zesting an orange from the grocery store would be sweet orange peel right, not bitter? And about how many oranges would it take to get 2oz worth of zest?